One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,8)(7,11,12,10)(13,14)(15,17)(16,18)(19,20)(21,22,25,24)(23,27,28,26)(2,4)(6,8)(10,11)(14,15)(16,20)(21,23,25,28)(22,26,24,27)(1,2)(3,4)(13,15,17,14)(16,19,20,18)(21,23)(22,27)(24,26)(25,28)(5,7)(6,10)(8,11)(9,12) involution — undirected(5,8,9,6)(7,11,12,10)(13,16,17,20)(14,18,15,19)(21,24,25,22)(23,26,28,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.